257384921 has 8 divisors (see below), whose sum is σ = 263880288. Its totient is φ = 250900000.

The previous prime is 257384917. The next prime is 257384957. The reversal of 257384921 is 129483752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257384921 - 2² = 257384917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257314921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77546 + ... + 80796.

It is an arithmetic number, because the mean of its divisors is an integer number (32985036).

Almost surely, 2^257384921 is an apocalyptic number.

It is an amenable number.

257384921 is a deficient number, since it is larger than the sum of its proper divisors (6495367).

257384921 is a wasteful number, since it uses less digits than its factorization.

257384921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5223.

The product of its digits is 120960, while the sum is 41.

The square root of 257384921 is about 16043.2204061404. The cubic root of 257384921 is about 636.1033752366.

The spelling of 257384921 in words is "two hundred fifty-seven million, three hundred eighty-four thousand, nine hundred twenty-one".